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Mathematics
Mathematics
Problem
Find the exact value of
cos
15
∘
\cos 15^{\circ}
cos
1
5
∘
. a)
6
−
2
4
\dfrac{\sqrt{6}-\sqrt{2}}{4}
4
6
−
2
b)
6
+
2
4
\dfrac{\sqrt{6}+\sqrt{2}}{4}
4
6
+
2
c)
6
4
\dfrac{\sqrt{6}}{4}
4
6
d)
3
2
\dfrac{\sqrt{3}}{2}
2
3
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